Sand-prevention fracturing wellhead device

Abstract

The invention belongs to the technical field of oil exploitation, and provides a sand-prevention fracturing wellhead device which comprises a main pipe, the side face of the main pipe communicates with a branch pipe, a mounting ring is slidably mounted in the branch pipe, and a second telescopic part for driving the mounting ring to move is fixedly mounted in the branch pipe. The installation ring and the branch pipe are coaxially arranged, the outer side face of the installation ring is in sliding contact with the interior of the branch pipe, a first filter screen is fixedly installed in the installation ring, a temporary storage box is arranged on the branch pipe and located on the outer side of the branch pipe, a storage box and a communicating groove are fixedly installed at the two ends of the temporary storage box respectively, and the communicating groove communicates with the branch pipe. Compared with the prior art, the device has the following beneficial effects that impurities on the first filter screen can be separated from the first filter screen due to the speed, meanwhile, petroleum flowing into the communicating groove can drive the impurities separated from the first filter screen to enter the temporary storage box, and cleaning of the impurities on the first filter screen is achieved; and the first filter screen can be cleaned without stopping petroleum conveying.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil extraction, and particularly relates to a sand control fracturing wellhead device. Background Art

[0002] In the process of oilfield development, in order to increase the production of oil wells, fracturing process technical measures are often adopted, that is, using high-pressure fracturing trucks and high-pressure pipe string facilities, and through the wellhead device and high-pressure fracturing pipe string, the fracturing sand is pressed into the formation.

[0003] A large amount of sand grains are mixed in the process of oil extraction. A large amount of sand grains will erode the inner wall of the device and reduce the service life of the device. Most of the current fracturing wellhead devices on the market generally filter sand grains through a filter screen. For example, in a Chinese patent with the patent publication number CN207526485U, it filters through a filter screen during use and cleans by vibrating the filter screen. However, due to the continuous transportation of oil, under the action of oil pressure, sand grain impurities will always be pressed on the filter screen, resulting in poor cleaning effect of the filter screen and affecting the filtering effect. Summary of the Invention

[0004] The purpose of the present invention is to provide a sand control fracturing wellhead device, aiming to solve the technical problem in the prior art that the filter screen cannot be cleaned during the oil transportation process, which affects the filtering effect.

[0005] The present invention is realized as follows: A sand control fracturing wellhead device includes a main pipe. A branch pipe is connected to the side of the main pipe. An installation ring is slidably installed in the branch pipe, and a second telescopic member for driving the installation ring to move is fixedly installed in the branch pipe. The installation ring is coaxially arranged with the branch pipe and the outer side of the installation ring is in sliding contact with the inner part of the branch pipe. A first filter screen is fixedly installed in the installation ring. A temporary storage box is arranged on the branch pipe. The temporary storage box is located outside the branch pipe, and a storage box and a communication groove are respectively fixedly installed at both ends of the temporary storage box. The communication groove is communicated with the branch pipe. When the installation ring is in the initial position, it blocks the communication area between the communication groove and the branch pipe. An oil return pipe is connected to the storage box. The oil return pipe is communicated with the area where the unfiltered oil is located in the branch pipe. A one-way valve is fixedly installed on the oil return pipe. A second filter screen is fixedly installed at the position where the oil return pipe is communicated with the storage box. A discharge pipe is connected to the storage box. A push plate is slidably installed in the temporary storage box, and a first telescopic member for driving the push plate to move is fixedly installed on the temporary storage box.

[0006] Further technical solution: The cross-section of the push plate matches that of the temporary storage box. When the push plate moves into the storage box, it contacts the second filter screen.

[0007] Further technical solution: A communication cavity is formed in the side wall of the mounting ring away from the communication groove. The communication cavity communicates with multiple groups of uniformly distributed oil spray pipes. The oil sprayed by the oil spray pipes flows along the surface of the first filter screen towards the communication groove. The oil spray pipes are located in the area where the unfiltered oil is in the branch pipe. An oil pump for delivering oil into the communication cavity is fixedly installed on the branch pipe.

[0008] Further technical solution: The oil pump is connected with an oil supply pipe and an oil extraction pipe. The oil supply pipe communicates with the communication cavity and the pipe of the oil supply pipe in the branch pipe is a flexible pipe. The oil extraction pipe communicates with the area where the filtered oil is in the branch pipe.

[0009] Further technical solution: A support plate located in the area where the unfiltered oil is in the branch pipe is fixedly installed on the side surface of the mounting ring. The support plate is located at the position of the mounting ring close to the communication groove. A first vertical plate is fixedly installed on the support plate. A first sliding plate is slidably installed on the first vertical plate. Multiple groups of first rotating plates located in the area where the unfiltered oil is in the branch pipe are rotatably installed in the branch pipe. A first connecting plate is fixedly and rotatably installed on the first rotating plate. One end of the first connecting plate away from the first rotating plate is fixedly connected to the first sliding plate.

[0010] Further technical solution: The rotation axes of multiple groups of the first rotating plates are distributed in a plane parallel to the first filter screen. When the first rotating plate rotates to a state parallel to the first filter screen, its end contacts the inner wall of the branch pipe, and there is a gap between adjacent two groups of first rotating plates. There is a space between the first rotating plate closest to the support plate and the inner wall of the branch pipe.

[0011] Further technical solution: A first baffle is fixedly installed in the branch pipe. The support plate penetrates through the first baffle and the two are slidably connected. When the first rotating plate closest to the support plate rotates to be parallel to the first filter screen, the side surface of this group of first rotating plates contacts the first baffle and closes the space between this group of first rotating plates and the inner wall of the branch pipe.

[0012] Further technical solution: A second vertical plate is fixedly installed on the side surface of the mounting ring. The second vertical plate and the first vertical plate are located on both sides of the mounting ring. The second vertical plate is located on the side of the mounting ring away from the communication groove. A second sliding plate is slidably installed on the second vertical plate. Multiple groups of second rotating plates located in the area where the filtered oil is in the branch pipe are rotatably installed in the branch pipe. The second rotating plate has the same structural arrangement as the first rotating plate. There is a space between the second rotating plate in the group farthest from the communication groove and the inner wall of the branch pipe.

[0013] Further technical solution: A second baffle is fixedly installed in the branch pipe. When the second rotating plate in the group farthest from the communication groove rotates to be parallel to the first filter screen, the side surface of this group of second rotating plates contacts the second baffle and closes the space between this group of second rotating plates and the inner wall of the branch pipe.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The second telescopic member drives the mounting ring to move rapidly towards the main pipe, exposing the communication groove. At this time, the impurities on the first filter screen will break away from the first filter screen due to the speed, and at the same time, the oil flowing into the communication groove will drive the impurities that have broken away from the first filter screen into the temporary storage box. Then, the first telescopic member drives the push plate to move towards the storage box. At this time, the push plate pushes the oil in the temporary storage box back into the branch pipe through the return oil pipe, and the second filter screen filters the impurities flowing back into the branch pipe to prevent the impurities from returning to the branch pipe, enabling the impurities on the first filter screen to be temporarily separated. The flowing oil carries the fallen impurities into the temporary storage box, and then the oil in the temporary storage box is refluxed and the impurities are separated, realizing the cleaning of the impurities on the first filter screen. The cleaning of the first filter screen can be achieved without stopping the oil transportation, ensuring that the first filter screen is always in a clean state and improving the filtering effect of the oil.

[0015] 2. The oil pump extracts the filtered oil through the suction pipe and transports it to the communication cavity. Under the action of pressure, the oil in the communication cavity is ejected through the spray pipe. The ejected oil flows along the surface of the first filter screen towards the communication groove. When the communication groove is in the closed state, the high-speed flowing ejected oil can push the impurities on the surface of the first filter screen towards the position close to the communication groove to gather, and at the same time, the high-speed flowing oil can preliminarily clean the surface of the first filter screen. When the communication groove is opened, under the action of the high-speed flowing oil, the impurities that have broken away from the first filter screen can better enter the communication groove, further improving the cleaning effect of the filter screen and the collection effect of the impurities in the branch pipe.

[0016] 3. A blocking surface that is close to a complete plane is formed by the first baffle and the first rotating plate. At the same time, an obstructive surface that is close to a complete plane is formed by the second rotating plate and the second baffle. The obstructive surface formed by the first rotating plate is located on the side of the branch pipe close to the communication groove, and the obstructive surface formed by the second rotating plate is located on the side of the branch pipe far from the communication groove. At this time, the oil can only pass through the first filter screen from the side far from the communication groove and leave from the side close to the communication groove, enabling the oil to flow only from the side far from the communication groove to the side close to the communication groove between the obstructive surfaces formed by the first rotating plate and the second rotating plate, realizing the directional flow of the oil. The directional flow of the oil can further clean the surface of the first filter screen, and at the same time can further carry impurities into the communication groove, further improving the efficiency of the impurities breaking away from the first filter screen and entering the communication groove, and further improving the cleaning of the first filter screen and the collection effect of the impurities, ensuring the filtering effect of the first filter screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the first perspective structure inside the branch pipe of the present invention.

[0019] Figure 3 It is a schematic diagram of the second perspective structure inside the branch pipe in the present invention.

[0020] Figure 4 It is a schematic cross-sectional structure diagram of the present invention.

[0021] Figure 5 is Figure 4 an enlarged schematic diagram of area A1 in

[0022] Figure 6 is Figure 4 an enlarged schematic diagram of area A2 in

[0023] Figure 7 is Figure 4 an enlarged schematic diagram of area A3 in

[0024] Figure 8 is Figure 4 an enlarged schematic diagram of area A4 in

[0025] In the accompanying drawings: 1, main pipe; 2, branch pipe; 3, mounting ring; 4, first filter screen; 5, communication cavity; 6, fuel injection pipe; 7, oil pump; 8, fuel supply pipe; 9, oil suction pipe; 10, temporary storage box; 11, storage box; 12, communication groove; 13, return oil pipe; 14, second filter screen; 15, first telescopic member; 16, push plate; 17, discharge pipe; 18, support plate; 19, first baffle; 20, first vertical plate; 21, first sliding plate; 22, first connecting plate; 23, first rotating plate; 24, second vertical plate; 25, second sliding plate; 26, second connecting plate; 27, second rotating plate; 28, second baffle; 29, second telescopic member. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0028] As Figures 1 - 8As shown in the figure, a sand control and fracturing wellhead device provided by the present invention includes a main pipe 1. A branch pipe 2 is connected to the side of the main pipe 1. An installation ring 3 is slidably installed in the branch pipe 2, and a second telescopic member 29 for driving the installation ring 3 to move is fixedly installed in the branch pipe 2. The installation ring 3 is coaxially arranged with the branch pipe 2 and the outer side surface of the installation ring 3 is in sliding contact with the inside of the branch pipe 2. A first filter screen 4 is fixedly installed in the installation ring 3. A temporary storage box 10 is arranged on the branch pipe 2. The temporary storage box 10 is located outside the branch pipe 2, and a storage box 11 and a communication groove 12 are respectively fixedly installed at both ends of the temporary storage box 10. The communication groove 12 is communicated with the branch pipe 2. When the installation ring 3 is in the initial position, it blocks the communication area between the communication groove 12 and the branch pipe 2. An oil return pipe 13 is connected to the storage box 11. The oil return pipe 13 is communicated with the area in the branch pipe 2 where the unfiltered oil is located. A one-way valve is fixedly installed on the oil return pipe 13. A second filter screen 14 is fixedly installed at the position where the oil return pipe 13 is communicated with the storage box 11. A discharge pipe 17 is connected to the storage box 11. A push plate 16 is slidably installed in the temporary storage box 10, and a first telescopic member 15 for driving the push plate 16 to move is fixedly installed on the temporary storage box 10. The cross section of the push plate 16 matches that of the temporary storage box 10. When the push plate 16 moves into the storage box 11, it contacts the second filter screen 14.

[0029] In practical application of this embodiment, oil enters the branch pipe 2 from one end of the branch pipe 2 far away from the main pipe 1. In the initial state, the temporary storage box 10 is empty. At this time, the push plate 16 is located at one end far away from the storage box 11, and the mounting ring 3 blocks the communication area between the communication groove 12 and the branch pipe 2. After the oil enters the branch pipe 2, it is filtered by the first filter screen 4. The filtered oil enters the main pipe 1 and continues to be transported. After a set time, the second telescopic member 29 drives the mounting ring 3 to quickly move towards the direction close to the main pipe 1, so that the communication groove 12 is exposed. Since the temporary storage box 10 is empty, at this time, the oil in the branch pipe 2 close to the first filter screen 4 will flow into the temporary storage box 10 through the communication groove 12. Due to the rapid movement of the mounting ring 3, the impurities on the first filter screen 4 will break away from the first filter screen 4 due to the speed, and at the same time, the oil flowing into the communication groove 12 will drive the impurities that have broken away from the first filter screen 4 into the temporary storage box 10. After a set time, the temporary storage box 10 is filled with oil. At this time, the mounting ring 3 resets to close the communication groove 12, and the first telescopic member 15 drives the push plate 16 to move towards the direction close to the storage box 11. At this time, the push plate 16 pushes the oil in the temporary storage box 10 to return to the branch pipe 2 through the oil return pipe 13, and the second filter screen iced impurities flowing back into the branch pipe 2 to avoid impurities from returning to the branch pipe 2. At the same time, after the push plate 16 moves above the storage box 11, it will scrape and clean the second filter screen 14. Under the action of the push plate 16, the impurities in the temporary storage box 10 move above the storage box 11 and finally drop into the storage box 11. After that, the push plate 16 resets, and the subsequent floating operation is repeated, so that the impurities on the first filter screen 4 can be briefly separated, and the falling impurities are brought into the temporary storage box 10 by the flowing oil. Then, the oil in the temporary storage box 10 is refluxed and the impurities are separated, realizing the cleaning of the impurities on the first filter screen 4. The cleaning of the first filter screen 4 can be realized without stopping the oil transportation, ensuring that the first filter screen 4 is always in a clean state, improving the filtering effect of the oil. After long-term use, the valve on the discharge pipe 17 is opened to make the oil in the storage box 11 flow out with impurities.

[0030] In an example of this embodiment, the first telescopic member 15 and the second telescopic member 29 are respectively a first electric telescopic rod and a second electric telescopic rod. Of course, they can also be other components such as hydraulic cylinders that can actively change their lengths. The push plate 16 is driven to move by the first electric telescopic rod, and the mounting ring 3 is driven to move by the second electric telescopic rod.

[0031] As Figures 1 - 4 shown, a sand control and fracturing wellhead device provided by the present invention is shown. A communication cavity 5 is opened in the side wall of the mounting ring 3 far away from the communication groove 12. The communication cavity 5 communicates with a plurality of uniformly distributed oil spray pipes 6. The oil sprayed by the oil spray pipes 6 flows along the surface of the first filter screen 4 towards the communication groove 12. The oil spray pipes 6 are located in the area of the unfiltered oil in the branch pipe 2. An oil pump 7 for transporting oil into the communication cavity 5 is fixedly installed on the branch pipe 2.

[0032] Specifically, the oil pump 7 is connected to an oil supply pipe 8 and an oil suction pipe 9. The oil supply pipe 8 is connected to the communication cavity 5, and the pipe of the oil supply pipe 8 located in the branch pipe 2 is a flexible pipe. The oil suction pipe 9 is connected to the area where the filtered oil is located in the branch pipe 2.

[0033] In actual application of this embodiment, the oil pump 7 extracts the filtered oil through the oil suction pipe 9 and transports it into the communication cavity 5. Under the action of pressure, the oil in the communication cavity 5 is ejected through the injection pipe 6. The ejected oil flows along the surface of the first filter screen 4 towards the communication groove 12. When the communication groove 12 is in the closed state, the ejected high-speed flowing oil can push the impurities on the surface of the first filter screen 4 to move and gather towards the position close to the communication groove 12. At the same time, the high-speed flowing oil can preliminarily clean the surface of the first filter screen 4. When the communication groove 12 is opened, under the action of the high-speed flowing oil, the impurities separated from the first filter screen 4 can better enter the communication groove 12, further improving the cleaning effect of the first filter screen 4 and the collection effect of impurities in the branch pipe 2.

[0034] As Figures 1 - 8 shown, a sand control fracturing wellhead device provided by the present invention. A support plate 18 located in the area of the unfiltered oil in the branch pipe 2 is fixedly installed on the side of the installation ring 3. The support plate 18 is located at a position of the installation ring 3 close to the communication groove 12. A first vertical plate 20 is fixedly installed on the support plate 18. A first sliding plate 21 is slidably installed on the first vertical plate 20. A plurality of groups of first rotating plates 23 located in the area of the unfiltered oil in the branch pipe 2 are rotatably installed in the branch pipe 2. A first connecting plate 22 is fixedly and rotatably installed on the first rotating plate 23. One end of the first connecting plate 22 away from the first rotating plate 23 is fixedly connected to the first sliding plate 21.

[0035] Specifically, the rotation axes of the plurality of groups of first rotating plates 23 are distributed in a plane parallel to the first filter screen 4. When the first rotating plate 23 rotates to a state parallel to the first filter screen 4, its end contacts the inner wall of the branch pipe 2, and there is a gap between adjacent two groups of first rotating plates 23. There is a space between the first rotating plate 23 closest to the support plate 18 and the inner wall of the branch pipe 2.

[0036] Specifically, a first baffle 19 is fixedly installed in the branch pipe 2. The support plate 18 penetrates through the first baffle 19 and the two are slidably connected. When the first rotating plate 23 closest to the support plate 18 rotates to a state parallel to the first filter screen 4, the side surface of this group of first rotating plates 23 contacts the first baffle 19 and closes the space between this group of first rotating plates 23 and the inner wall of the branch pipe 2.

[0037] Specifically, a second vertical plate 24 is fixedly installed on the side of the mounting ring 3. The second vertical plate 24 and the first vertical plate 20 are located on both sides of the mounting ring 3. The second vertical plate 24 is located on the side of the mounting ring 3 away from the communication groove 12. A second sliding plate 25 is slidably installed on the second vertical plate 24. A plurality of groups of second rotating plates 27 located in the area where the petroleum is filtered in the branch pipe 2 are rotatably installed in the branch pipe 2. The second rotating plates 27 have the same structural arrangement as the first rotating plates 23. There is a gap between the inner wall of the branch pipe 2 and the group of second rotating plates 27 that is farthest from the communication groove 12.

[0038] Specifically, a second baffle 28 is fixedly installed in the branch pipe 2. When the second rotating plate 27 farthest from the communication groove 12 rotates to be parallel to the first filter screen 4, the side surface of this group of second rotating plates 27 contacts the second baffle 28 and closes the gap between this group of second rotating plates 27 and the inner wall of the branch pipe 2.

[0039] In practical application of this embodiment, in the initial state, multiple groups of first rotating plates 23 and multiple groups of second rotating plates 27 are both in a state of inclining close to the horizontal plane, and petroleum can pass through between the first rotating plates 23 and the second rotating plates 27, reducing the obstruction to the flow of petroleum. After the mounting ring 3 moves towards the main pipe 1, the mounting ring 3 drives the first vertical plate 20 to move towards the mounting ring 3 through the support plate 18. Further, the first vertical plate 20 can push the first rotating plate 23 to rotate through the first sliding plate 21 and the first connecting plate 22. The rotation axis of the first rotating plate 23 is located at one end close to the mounting ring 3. When the mounting ring 3 moves to the set position, multiple groups of first rotating plates 23 all rotate to a state parallel to the first filter screen 4. There is only a narrow gap for the first rotating plates 23 to rotate between the first rotating plates 23, and the end of the first rotating plate 23 contacts the inner wall of the branch pipe 2. The first baffle 19 also contacts the first rotating plate 23, forming a blocking surface close to a complete plane through the first baffle 19 and the first rotating plate 23. At the same time, when the mounting ring 3 moves, it drives the second rotating plate 27 to rotate through the second vertical plate 24, the second sliding plate 25, and the second connecting plate 26, so that the second rotating plate 27 and the second baffle 28 form a blocking surface close to a complete plane. The blocking surface formed by the first rotating plate 23 is located on the side of the branch pipe 2 close to the communication groove 12, and the blocking surface formed by the second rotating plate 27 is located on the side of the branch pipe 2 far from the communication groove 12. At this time, petroleum can only pass through the first filter screen 4 from the side far from the communication groove 12 and leave from the side close to the communication groove 12, so that petroleum can only flow from the side far from the communication groove 12 to the side close to the communication groove 12 between the blocking surfaces formed by the first rotating plate 23 and the second rotating plate 27, realizing the directional flow of petroleum. The directional flow of petroleum can further clean the surface of the first filter screen 4, and at the same time can further carry impurities into the communication groove 12, further improving the efficiency of impurities detaching from the first filter screen 4 and entering the communication groove 12, further improving the cleaning of the first filter screen 4 and the collection effect of impurities, ensuring the filtering effect of the first filter screen 4. Subsequently, when the mounting ring 3 resets, the first rotating plate 23 and the second rotating plate 27 reset, enabling the petroleum to flow smoothly.

[0040] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0041] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only includes an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sand control and fracturing wellhead device, comprising a main pipe (1), characterized in that, The side of the main pipe (1) is connected to a branch pipe (2). An installation ring (3) is slidably installed in the branch pipe (2), and a second telescopic member (29) for driving the installation ring (3) to move is fixedly installed in the branch pipe (2). The installation ring (3) is coaxially arranged with the branch pipe (2), and the outer side of the installation ring (3) is in sliding contact with the inside of the branch pipe (2). A first filter screen (4) is fixedly installed inside the installation ring (3). A temporary storage box (10) is arranged on the branch pipe (2). The temporary storage box (10) is located outside the branch pipe (2), and a storage box (11) and a communication groove (12) are respectively fixedly installed at both ends of the temporary storage box (10). The communication groove (12) is communicated with the branch pipe (2). When the installation ring (3) is in the initial position, it blocks the communication area between the communication groove (12) and the branch pipe (2). A return oil pipe (13) is communicated with the storage box (11). The return oil pipe (13) is communicated with the area where the unfiltered oil is located in the branch pipe (2). A one-way valve is fixedly installed on the return oil pipe (13), and a second filter screen (14) is fixedly installed at the position where the return oil pipe (13) is communicated with the storage box (11). The storage box (11) is communicated with a discharge pipe (17). A push plate (16) is slidably installed in the temporary storage box (10), and a first telescopic member (15) for driving the push plate (16) to move is fixedly installed on the temporary storage box (10).

2. The sand control and fracturing wellhead device according to claim 1, characterized in that, The cross-section of the push plate (16) fits that of the temporary storage box (10). When the push plate (16) moves into the storage box (11), it contacts the second filter screen (14).

3. The sand control and fracturing wellhead device according to claim 1, characterized in that, A communication cavity (5) is formed in the side wall of the installation ring (3) away from the communication groove (12). The communication cavity (5) is communicated with a plurality of uniformly distributed fuel injection pipes (6). The oil sprayed out by the fuel injection pipes (6) flows along the surface of the first filter screen (4) towards the communication groove (12). The fuel injection pipes (6) are located in the area where the unfiltered oil is located in the branch pipe (2). An oil pump (7) for conveying oil into the communication cavity (5) is fixedly installed on the branch pipe (2).

4. The sand control and fracturing wellhead device according to claim 3, characterized in that, The oil pump (7) is communicated with an oil supply pipe (8) and an oil suction pipe (9). The oil supply pipe (8) is communicated with the communication cavity (5), and the pipe of the oil supply pipe (8) located in the branch pipe (2) is a flexible pipe. The oil suction pipe (9) is communicated with the area where the filtered oil is located in the branch pipe (2).

5. The sand control and fracturing wellhead device according to claim 1, characterized in that, A support plate (18) located in the area where the unfiltered oil is located in the branch pipe (2) is fixedly installed on the side of the installation ring (3). The support plate (18) is located at the position of the installation ring (3) close to the communication groove (12). A first vertical plate (20) is fixedly installed on the support plate (18). A first sliding plate (21) is slidably installed on the first vertical plate (20). A plurality of first rotating plates (23) located in the area where the unfiltered oil is located in the branch pipe (2) are rotatably installed in the branch pipe (2). A first connecting plate (22) is fixedly and rotatably installed on the first rotating plate (23). One end of the first connecting plate (22) away from the first rotating plate (23) is fixedly connected to the first sliding plate (21).

6. The sand control and fracturing wellhead device according to claim 5, characterized in that, The rotation axes of multiple groups of the first rotating plates (23) are distributed in a plane parallel to the first filter screen (4). When the first rotating plate (23) rotates to a state parallel to the first filter screen (4), its end contacts the inner wall of the branch pipe (2), and there is a gap between adjacent groups of the first rotating plates (23). There is a space between the group of the first rotating plates (23) close to the support plate (18) and the inner wall of the branch pipe (2).

7. The sand control and fracturing wellhead device according to claim 6, characterized in that, A first baffle (19) is fixedly installed in the branch pipe (2). The support plate (18) penetrates through the first baffle (19) and they are slidably connected. When the first rotating plate (23) close to the support plate (18) rotates to be parallel to the first filter screen (4), the side surface of this group of the first rotating plates (23) contacts the first baffle (19) and closes the space between this group of the first rotating plates (23) and the inner wall of the branch pipe (2).

8. The sand control fracturing wellhead device according to claim 1, characterized in that, A second vertical plate (24) is fixedly installed on the side surface of the mounting ring (3). The second vertical plate (24) and the first vertical plate (20) are located on both sides of the mounting ring (3). The second vertical plate (24) is located on the side of the mounting ring (3) far from the communication groove (12). A second sliding plate (25) is slidably installed on the second vertical plate (24). Multiple groups of second rotating plates (27) located in the area where the petroleum is filtered in the branch pipe (2) are rotatably installed in the branch pipe (2). The second rotating plates (27) have the same structural arrangement as the first rotating plates (23). There is a space between the group of the second rotating plates (27) far from the communication groove (12) and the inner wall of the branch pipe (2).

9. The sand control fracturing wellhead device according to claim 8, characterized in that, A second baffle (28) is fixedly installed in the branch pipe (2). When the group of the second rotating plates (27) far from the communication groove (12) rotates to be parallel to the first filter screen (4), the side surface of this group of the second rotating plates (27) contacts the second baffle (28) and closes the space between this group of the second rotating plates (27) and the inner wall of the branch pipe (2).

Images